Paper-making machine



D. H. SCHWARTZ.

PAPER MAKING MACHINE.

APPLICATION man APR. 16, I920- RENEWED MAY 13. 1922.

Patented 0st. 31, 11922.,

felt that is approaching the couch roll which idntented Get. 31, 31922.I

entree stares transit eareur @FFEQE.

DANIEL H. SCHWARTZ, 0F HOLYOKE, MASSACHUSETTS, ,ASSIGNUR T0 HOLYOKEVACUUM SLUICE COMPANY, 01E SPRINGFIELD, MASSACHUSETTS, A CORJPO- RATION01E MASSACHUSETTS.

. PAPER-MAKING MACHINE. 7

Application filed April 16, 1920, Serial No. 374,376. Renewed may 13,1922. Serial No. 560,715.

T 0 all whom it may concern Be it known that l, DANIEL H. SCHWARTZ, acitizen of the United States, and resident of Holyoke, in the county ofHampden and State of Massachusetts, have invented certain new and usefulImprovements in Paper- Making Machines, of which the following is aspecification. c

This invention relates to paper making machines and is shown moreparticularly applied to that class of machines in whlch a series ofcylinder molds are employed in combination with properly arranged couchrolls to transfer the pulp in thin sheets or layers to the carrier feltor apron, the couch rolls acting to press or squeeze out the water fromthe pulp layer that is being transferred to the carrier felts.

Heretofore it has been customary to locate a slice bar in front of eachcouch roll to prevent the water squeezed out of the pulp by the couchroll, from back-flowing upon the is still carrying one or more layersdeposited thereon by the preceding cylinder molds of the machine.

The present invention is intended to provide a means for taking up thewater from in front of the couch roll as fast as it is squeezed'out andpositively conduct ng it away'so as to avoid unnecessary wetting orsaturation of the felt and the pulp at this point, comprises essentiallyin combination with the cylinder mold and the couch roll a conduit ortrough arranged in contact with the felt somewhat in advance of thecouch roll so as to remove the water therefrom and convey'it away in a.manner to avoid the saturating of the advancing felt and its layer ofpulp. V

These and other features of the nvent on will be explained in detail 1nthis speclfication and will be defined in the claims hereto annexed.

In the accom anying drawings I have 11- lustrated an e ective constructon and arrangement embodying the princlples of this invention in which:3 I

Figure 1 is a plan view ofone end of a pulp machine, so muchthereof beng shown as is necessary to an understanding of the present invention.

Figure 2 is a side elevation thereof. Figure 3 is a central sectionthrough the water-removing member the same being. shown on. enlargedscale.

Referring now to the drawings, the tank 0; having a series of concavedbottom vats a for holdlng the pulp is of the usual construction. Inthese separate vats are mounted a correspondlng serles of cylinder moldsconnected with a suction pump in the usual manner so as to create asuction through the reticulated peripheral wall of the cylinder molds 1norder to cause a thin layer of pulp to adhere to the circumference of.the revolving cyllndermold which layer of pulp is carried up intocontact with the usual carrier felt d above which rests the usual couchroll 0 which has a finely perforated circumferentlal wall, and isrotatably supported in the free ends of the opposite pivotal arms 0which hold it in position while allowing it to press the carrier feltdown against the mterposedlayer of pulp that has been picked up andcarried to the felt by each cylinder mold. The supporting arms 0 aremounted 1n any suitable upright or brackets e arranged on opposite sidesof the machine.

As the carrier felt 03" travels along the machine in the directionindicated by the arrow, it picks up from each successive cylinder mold athin layer of pulp which adheres to the under side of the carrier felt,the said aggregated layers being carried around a suction roll f at theend of the machine and along the top side of the carrier felt until thecohering layers are deposited at some other part ofthe machine forfurther treatment, all in accordance with the usual practice.

lit will be seen that as each layer of the combination layers ofpulp'passes between successive cylinder molds and their cooperatingcouch rolls the latter perform their function of squeezing out the waterfrom the pulp. When, according to the common practice heretofore, aslice bar is laid across the felt above the'top of the cylinder moldthere must be a substantial accumulation of water in the longitudinalspace between the slice bar and the couch roll which has to flow ed tothe opposite ends of the cylinder mold which results in a substantialwetting of the felt and of its adhering layer of pulp as they approachthe couch roll;

l have overcome this difierence by providing means for positivelyconducting away I the squeezed out water so as to preventitsaccumulation and the consequent separation of the pulp layer from thefelt. To this end I provide a pipe or tubular conduit (1 Which of the.nozz

is provided with a longitudinal slot d"; on

one side and which has at one or both ends. an outlet 03? connected withan exhaustor suction pipe d through which sufficient suction is createdby the action of a suitable.

pump not shown. To facilitate they draw d passed through transverseslots in the flan e d. p

T is liquid conduit or trough is supported in contact with the felt dslightly in ad? vance of the-couch roll by means of pivoted arms d'whichare preferably provided with counter-weights d so as to secure thedesired degree of, pressure of the nozzle member upon the carrier feltinterposed between it and the top of the cylinder mold.

through The action of the deviceis as follows: A. partial .vacuum orsuction is roduced the suction pipes d and t e slight quantity of freewater that oozes out ofthe p ll ,in front of the couch roll is instantlyic ed up and carried off through the outet' pipe so that no accumulationof water is permitted at thi point. In consequence,

Y thereof, the. feltand its underlying felt thus leaving ompalatively"little f ee liquid in, the pulp, to. befsqueezed I out by the couchroll. I In consequence ofv revious ly deposed layers of pulp approach te couch roll without any additional wetting or exposure to water whichtends to impair the action of the couch 'roll'in expelling water fromthe pulp. The invention, therefore.

eep the felt in an unsaturated Ondition vvl'll lch facilitates.the-operation of the mac e.- I I v V .By dispqsing thesuction nozzledirectly ainst the face of the felt the accumulation 0 liquid on the,carrier felt in advance .of

the couch roll is prevented both because such I arran ement whollyavoids} the possibility of any accumulation of liquid byreason-of thedirect suction exerted oncthe surface of the felt, butfurthfilmore andbetause it is found in practice thatsuch an arra. ement anddispositionof the suction nozz e acts to extract the liquid directlythrough the e by means. of clamping screwsv serves to ranged to-travthis arrangement the pulp is uniformly compacted and distributed and isgenerally free:

from blisters or air bubbles which are frequently found where anyaccumulation of liquid on the surface of the felt is permitted.

. What'I claim is:

. 1. Ina paper machine the combination of .a ulp carrying cylinder mold,a couch roll mounted to press against the said cylinder mold, a carrierfelt arranged to travel betweenthe cylinder mold and the. couch roll.and'ito take up the pulp from said cylindermdd, a suction nozzle mountedin contact with the .felt in advance of the couch roll to draw off theliquid squeezed from the pulp to avoid saturation of the advancing felt,substantially as described.

.2. The combination of a pulp carryin cylinder imold a carrier felt, a.couch ro arranged 'topres's'the felt a .ainst the cylinder to squeezetheinterpose felt, a tubular conduit having a suction nozzle restingagainst the felt, and means for varying the width of the nozzle.opening, substantially as described.

3. In a paper machine the combination of the "Pulp carrying cy mold,cooper ating couch roll and carrier-felt,'an exhaust memberarranged'in'front of the couch roll in contact with the feltforconveying away the water from the felt, said exhaust. meme her beingprovided with an. elongate'd'nozr "zle extending parallel tothe couch.roll, and

an adjustable-plate for narrowing or widen:

ing the width of said elongated nozzle, sub

stantially as described.

4. In a paper. machine, the combination with ,a' pulp-carryin cylindermold, a

couch roll, a carrier fe t interposed between the mold andflthe couchroll to travel between them, and a. liquid suction member located infront ofthe couch roll and arranged to extract the liquid from the feltapproaching the couch roll thereby preventing an accumulation of liquidon the surface of t e car'- rier felt, substantiall as described. a

i 5 In-a. paper mac ine, the. combination of a-"cylinder ulp mold, acarrier .felt ar over and be pressed against the periphery of. said mold-alo" a :line where it is' covered with.-pu lp,1aho ow suction nozzle incontact with the/carrier felt alon the transverse line of contactbetween the elt and the. pulp covered mold, whereby a direct suctionthrough. theT'felt is. exerted any accumulation 'of liquidonthe'jfeltfisub-f stantially .as described. '1-

6. In. a paper machine, the. combination of a revolving Pulp mold, a.carrier felt arranged to'trave in peripheral contact witlf to extractthe fluid [therefrom andprevent the mold totransfer .the.. p1f1,.lptherefrom, a

suetiondevice having an-intalsenozzle arranged ndirect contact with thatportion of the felt that is engaged with the pulp mold in order toextract the liquid from the felt, said nozzle having an intake that isvariable as to width in order to vary the force of the suction appliedto the felt, substantially as described.

7. A vacuum sluice for a paper making machine embracing in itsconstruction an elongated tubular exhaust member provided with alongitudinally extending nozzle formed with a felt-engaging face adaptedthrough said felt-engaging face to form 15 direct suction contact withthe felt in order to. extract moisture and air directly from asdescribed.

the felt, substantiall I have subscribed the In Witness whereo abovespecification.

DANIEL H. sciavvanrz.

